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2. M. Benedict, T. H.Pigford: Nuclear Chemical Engineering (McGraw-Hill, New York 1957) Chap. 10
3. H. London: “Separation Theory of Statistical Processes”, in Separation or Isotopes, Sect. 1, ed. by H.London (George Newness, London 1961)
4. J.Shacter, E. von Halle, R. L. Hoglund: “Diffusion Separation Methods”, in Encyclopedia of Chemical Technology, Vol. 7 (Wiley and Sons, New York 1965) p. 91
5. H. R. C. Pratt: Countercurrent Separation Processes (Elsevier, Amsterdam 1967) Chaps. I, II, III, XI